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Partial trisomy 12p due to t(12;21)pat translocation
Insights
Partial trisomy 12p, a chromosomal duplication, was identified in an infant girl with developmental delays and distinct facial features. Further research is needed to fully define trisomy 12p syndrome due to limited case data.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Genetics
Background:
- Chromosome 12p duplication is a rare chromosomal abnormality.
- Understanding the phenotypic spectrum of partial trisomy 12p is crucial for genetic counseling and diagnosis.
Observation:
- An infant girl presented with psychomotor retardation, hypotonia, and dysmorphic features including a prominent forehead, ptosis, and a flat nose.
- Karyotyping revealed partial trisomy (interchromosomal duplication) of chromosome 12 short arm (12p).
Findings:
- Comparison with five previously reported cases of similar chromosomal imbalance suggests common features.
- However, the limited number of reported cases precludes definitive characterization of a trisomy 12p syndrome.
Implications:
- This case contributes to the understanding of the clinical manifestations associated with trisomy 12p.
- Further identification and characterization of trisomy 12p cases are necessary to establish a distinct syndrome and improve diagnostic accuracy.
Abstract:
Partial trisomy (interchromosomal duplication) of the short arm of chromosome No. 12 was observed in an infant girl with psychomotor retardation, prominent forehead, ptosis of the right eyelid, esotropia/exotropia, flat nose, hypotonia and other anomalies. A comparison of her features with those in five reported cases with a similar chromosomal imbalance shows certain features common to all, but the material is too limited for definitive characterization of a trisomy 12p syndrome.